BoilerFaultCodes 4.3
IGNITION LOCKOUT
Ideal Logic+ Combi C Fault codes & diagnostics
27 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Combi Natural Gas 2016-present
GC Numbers 47-349-1547-349-1647-349-1747-349-9347-349-9447-349-95
Download the Ideal Logic+ Combi C manual
PDF
Versions & GC numbers
The fault code is already on your display
Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →
Severity at a glance
Each cell = one fault code. Hover to identify. 27 Unrated
Which version do you have?
The GC number on your boiler's data badge identifies the exact appliance and production years, as recorded in the UK Product Characteristics Database.
| GC number | Appliance (register name) | Produced |
|---|---|---|
| 47-349-15 | LOGIC + COMBI C24 | 2016–present |
| 47-349-16 | LOGIC + COMBI C30 | 2016–present |
| 47-349-17 | LOGIC + COMBI C35 | 2016–present |
| 47-349-93 | LOGIC COMBI2 C24 | 2022–present |
| 47-349-94 | LOGIC COMBI2 C30 | 2022–present |
| 47-349-95 | LOGIC COMBI2 C35 | 2022–present |
Appliance names and production years are taken from the UK Product Characteristics Database (the SAP/SEDBUK register). Where a GC number is also printed in this model's own manufacturer manual, both sources were checked to agree.
Just want the most common Ideal Logic+ Combi C faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes
All 27 documented codes
Tap any card for details
4.4
FLAME ON BEFORE GAS VALVE ON
4.5
LOW WATER PRESSURE
4.6
FLAME LOSS
4.7
FAN FAULT
4.8
Flow Thermistor Fault
4.9
Return Thermistor Fault
4.10
Outside Sensor Fault
4.11
No CH Operation but HW Works OK
4.12
No HW But CH On
Showing 11–20 of 27
4.13
No Display
Fan Fault
Fan Fault
Flame Loss
Flame Loss
Flame On Before Gas On
False Flame Lockout
Flow Thermistor Fault
Flow Thermistor Fault
Flow/Return Reversed
Flow/Return Reversed
High Mains Voltage
High Mains Voltage
Ignition Lockout
The boiler does not light after 5 attempts
Low Mains Voltage
Low Mains Voltage
Outside Sensor Fault
Outside Sensor Fault
Showing 21–27 of 27
Overheat Lockout
Flow Temperature Overheat Lockout
PCB Fault
Replace PCB
Return Thermistor Fault
Return Thermistor Fault
Room Stat Fault
Check Room Stat Batteries
Spare PCB Not Set
Spare PCB Not Set
Too Many Restarts
Restart occurs 5 times within 15 minutes
Water Pressure
Low Water Pressure
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